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scripts/link-vmlinux.sh
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#!/bin/sh |
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# SPDX-License-Identifier: GPL-2.0 |
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# # link vmlinux # |
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# vmlinux is linked from the objects selected by $(KBUILD_VMLINUX_OBJS) and # $(KBUILD_VMLINUX_LIBS). Most are built-in.a files from top-level directories # in the kernel tree, others are specified in arch/$(ARCH)/Makefile. # $(KBUILD_VMLINUX_LIBS) are archives which are linked conditionally # (not within --whole-archive), and do not require symbol indexes added. |
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# # vmlinux # ^ # | |
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# +--< $(KBUILD_VMLINUX_OBJS) # | +--< init/built-in.a drivers/built-in.a mm/built-in.a + more |
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# | |
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# +--< $(KBUILD_VMLINUX_LIBS) # | +--< lib/lib.a + more # | |
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# +-< ${kallsymso} (see description in KALLSYMS section) # # vmlinux version (uname -v) cannot be updated during normal # descending-into-subdirs phase since we do not yet know if we need to # update vmlinux. # Therefore this step is delayed until just before final link of vmlinux. # # System.map is generated to document addresses of all kernel symbols # Error out on error set -e |
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LD="$1" KBUILD_LDFLAGS="$2" LDFLAGS_vmlinux="$3" |
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# Nice output in kbuild format # Will be supressed by "make -s" info() { if [ "${quiet}" != "silent_" ]; then |
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printf " %-7s %s " "${1}" "${2}" |
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fi } # Link of vmlinux.o used for section mismatch analysis # ${1} output file modpost_link() { |
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local objects |
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objects="--whole-archive \ |
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${KBUILD_VMLINUX_OBJS} \ |
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--no-whole-archive \ --start-group \ ${KBUILD_VMLINUX_LIBS} \ --end-group" |
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${LD} ${KBUILD_LDFLAGS} -r -o ${1} ${objects} |
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} |
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objtool_link() { local objtoolopt; if [ -n "${CONFIG_VMLINUX_VALIDATION}" ]; then objtoolopt="check" if [ -z "${CONFIG_FRAME_POINTER}" ]; then objtoolopt="${objtoolopt} --no-fp" fi if [ -n "${CONFIG_GCOV_KERNEL}" ]; then objtoolopt="${objtoolopt} --no-unreachable" fi if [ -n "${CONFIG_RETPOLINE}" ]; then objtoolopt="${objtoolopt} --retpoline" fi if [ -n "${CONFIG_X86_SMAP}" ]; then objtoolopt="${objtoolopt} --uaccess" fi info OBJTOOL ${1} tools/objtool/objtool ${objtoolopt} ${1} fi } |
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# Link of vmlinux |
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# ${1} - output file |
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# ${2}, ${3}, ... - optional extra .o files |
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vmlinux_link() { local lds="${objtree}/${KBUILD_LDS}" |
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local output=${1} |
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local objects |
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local strip_debug |
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|
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info LD ${output} |
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# skip output file argument shift |
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# The kallsyms linking does not need debug symbols included. if [ "$output" != "${output#.tmp_vmlinux.kallsyms}" ] ; then strip_debug=-Wl,--strip-debug fi |
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if [ "${SRCARCH}" != "um" ]; then |
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objects="--whole-archive \ |
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${KBUILD_VMLINUX_OBJS} \ |
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--no-whole-archive \ --start-group \ ${KBUILD_VMLINUX_LIBS} \ --end-group \ |
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${@}" |
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|
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${LD} ${KBUILD_LDFLAGS} ${LDFLAGS_vmlinux} \ |
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${strip_debug#-Wl,} \ |
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-o ${output} \ |
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-T ${lds} ${objects} |
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else |
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objects="-Wl,--whole-archive \ |
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${KBUILD_VMLINUX_OBJS} \ |
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-Wl,--no-whole-archive \ -Wl,--start-group \ ${KBUILD_VMLINUX_LIBS} \ -Wl,--end-group \ |
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${@}" |
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|
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${CC} ${CFLAGS_vmlinux} \ |
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${strip_debug} \ |
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-o ${output} \ |
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-Wl,-T,${lds} \ ${objects} \ |
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-lutil -lrt -lpthread |
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rm -f linux fi } |
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# generate .BTF typeinfo from DWARF debuginfo |
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# ${1} - vmlinux image # ${2} - file to dump raw BTF data into |
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gen_btf() { |
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local pahole_ver |
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|
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if ! [ -x "$(command -v ${PAHOLE})" ]; then |
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echo >&2 "BTF: ${1}: pahole (${PAHOLE}) is not available" |
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return 1 |
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fi |
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pahole_ver=$(${PAHOLE} --version | sed -E 's/v([0-9]+)\.([0-9]+)/\1\2/') |
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if [ "${pahole_ver}" -lt "116" ]; then echo >&2 "BTF: ${1}: pahole version $(${PAHOLE} --version) is too old, need at least v1.16" |
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return 1 |
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fi |
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vmlinux_link ${1} |
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info "BTF" ${2} |
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LLVM_OBJCOPY=${OBJCOPY} ${PAHOLE} -J ${1} |
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|
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# Create ${2} which contains just .BTF section but no symbols. Add # SHF_ALLOC because .BTF will be part of the vmlinux image. --strip-all # deletes all symbols including __start_BTF and __stop_BTF, which will # be redefined in the linker script. Add 2>/dev/null to suppress GNU # objcopy warnings: "empty loadable segment detected at ..." ${OBJCOPY} --only-section=.BTF --set-section-flags .BTF=alloc,readonly \ --strip-all ${1} ${2} 2>/dev/null # Change e_type to ET_REL so that it can be used to link final vmlinux. # Unlike GNU ld, lld does not allow an ET_EXEC input. printf '\1' | dd of=${2} conv=notrunc bs=1 seek=16 status=none |
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} |
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# Create ${2} .o file with all symbols from the ${1} object file kallsyms() { info KSYM ${2} local kallsymopt; if [ -n "${CONFIG_KALLSYMS_ALL}" ]; then |
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kallsymopt="${kallsymopt} --all-symbols" |
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fi |
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if [ -n "${CONFIG_KALLSYMS_ABSOLUTE_PERCPU}" ]; then |
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kallsymopt="${kallsymopt} --absolute-percpu" fi |
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if [ -n "${CONFIG_KALLSYMS_BASE_RELATIVE}" ]; then kallsymopt="${kallsymopt} --base-relative" fi |
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local aflags="${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL} \ ${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS}" |
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|
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local afile="`basename ${2} .o`.S" ${NM} -n ${1} | scripts/kallsyms ${kallsymopt} > ${afile} ${CC} ${aflags} -c -o ${2} ${afile} |
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} |
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# Perform one step in kallsyms generation, including temporary linking of # vmlinux. kallsyms_step() { kallsymso_prev=${kallsymso} |
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kallsyms_vmlinux=.tmp_vmlinux.kallsyms${1} kallsymso=${kallsyms_vmlinux}.o |
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|
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vmlinux_link ${kallsyms_vmlinux} "${kallsymso_prev}" ${btf_vmlinux_bin_o} |
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kallsyms ${kallsyms_vmlinux} ${kallsymso} } |
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# Create map file with all symbols from ${1} # See mksymap for additional details mksysmap() { ${CONFIG_SHELL} "${srctree}/scripts/mksysmap" ${1} ${2} } |
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sorttable() |
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{ |
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${objtree}/scripts/sorttable ${1} |
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} |
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# Delete output files in case of error |
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cleanup() { |
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rm -f .btf.* |
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rm -f .tmp_System.map |
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rm -f .tmp_vmlinux* rm -f System.map rm -f vmlinux rm -f vmlinux.o } |
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on_exit() { if [ $? -ne 0 ]; then cleanup fi } trap on_exit EXIT on_signals() { exit 1 } trap on_signals HUP INT QUIT TERM |
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# Use "make V=1" to debug this script case "${KBUILD_VERBOSE}" in *1*) set -x ;; esac if [ "$1" = "clean" ]; then cleanup exit 0 fi # We need access to CONFIG_ symbols |
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. include/config/auto.conf |
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|
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# Update version info GEN .version |
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if [ -r .version ]; then VERSION=$(expr 0$(cat .version) + 1) echo $VERSION > .version |
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else |
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rm -f .version echo 1 > .version |
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fi; # final build of init/ |
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${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init need-builtin=1 |
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|
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#link vmlinux.o info LD vmlinux.o modpost_link vmlinux.o |
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objtool_link vmlinux.o |
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# modpost vmlinux.o to check for section mismatches |
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${MAKE} -f "${srctree}/scripts/Makefile.modpost" MODPOST_VMLINUX=1 |
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|
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info MODINFO modules.builtin.modinfo ${OBJCOPY} -j .modinfo -O binary vmlinux.o modules.builtin.modinfo |
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info GEN modules.builtin # The second line aids cases where multiple modules share the same object. tr '\0' ' ' < modules.builtin.modinfo | sed -n 's/^[[:alnum:]:_]*\.file=//p' | tr ' ' ' ' | uniq | sed -e 's:^:kernel/:' -e 's/$/.ko/' > modules.builtin |
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|
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btf_vmlinux_bin_o="" |
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if [ -n "${CONFIG_DEBUG_INFO_BTF}" ]; then |
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btf_vmlinux_bin_o=.btf.vmlinux.bin.o if ! gen_btf .tmp_vmlinux.btf $btf_vmlinux_bin_o ; then |
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echo >&2 "Failed to generate BTF for vmlinux" echo >&2 "Try to disable CONFIG_DEBUG_INFO_BTF" exit 1 |
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fi fi |
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kallsymso="" |
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kallsymso_prev="" |
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kallsyms_vmlinux="" if [ -n "${CONFIG_KALLSYMS}" ]; then # kallsyms support # Generate section listing all symbols and add it into vmlinux # It's a three step process: # 1) Link .tmp_vmlinux1 so it has all symbols and sections, # but __kallsyms is empty. # Running kallsyms on that gives us .tmp_kallsyms1.o with # the right size # 2) Link .tmp_vmlinux2 so it now has a __kallsyms section of # the right size, but due to the added section, some # addresses have shifted. # From here, we generate a correct .tmp_kallsyms2.o |
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# 3) That link may have expanded the kernel image enough that # more linker branch stubs / trampolines had to be added, which # introduces new names, which further expands kallsyms. Do another # pass if that is the case. In theory it's possible this results # in even more stubs, but unlikely. # KALLSYMS_EXTRA_PASS=1 may also used to debug or work around # other bugs. # 4) The correct ${kallsymso} is linked into the final vmlinux. |
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# # a) Verify that the System.map from vmlinux matches the map from # ${kallsymso}. |
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kallsyms_step 1 kallsyms_step 2 |
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|
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# step 3 |
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size1=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" ${kallsymso_prev}) size2=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" ${kallsymso}) |
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if [ $size1 -ne $size2 ] || [ -n "${KALLSYMS_EXTRA_PASS}" ]; then |
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kallsyms_step 3 |
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fi fi |
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vmlinux_link vmlinux "${kallsymso}" ${btf_vmlinux_bin_o} |
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|
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# fill in BTF IDs if [ -n "${CONFIG_DEBUG_INFO_BTF}" ]; then info BTFIDS vmlinux ${RESOLVE_BTFIDS} vmlinux fi |
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if [ -n "${CONFIG_BUILDTIME_TABLE_SORT}" ]; then info SORTTAB vmlinux |
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if ! sorttable vmlinux; then echo >&2 Failed to sort kernel tables exit 1 fi |
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fi |
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info SYSMAP System.map mksysmap vmlinux System.map # step a (see comment above) if [ -n "${CONFIG_KALLSYMS}" ]; then mksysmap ${kallsyms_vmlinux} .tmp_System.map if ! cmp -s System.map .tmp_System.map; then |
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echo >&2 Inconsistent kallsyms data |
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echo >&2 Try "make KALLSYMS_EXTRA_PASS=1" as a workaround |
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exit 1 fi fi |